package com.example.app2;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import com.squareup.picasso.Picasso;
public class PhotoAdapter extends BaseAdapter {
    Context context;
    String []arr;
    public PhotoAdapter(Context context, String[] arr) {
        this.context = context;
        this.arr = arr; }
    @Override
    public int getCount() { return arr.length; }
    @Override
    public Object getItem(int position) { return arr[position]; }
    @Override
    public long getItemId(int position) { return position; }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        if (convertView == null) {
            convertView = LayoutInflater.from(context).inflate(R.layout.item_photo,null);
            holder = new ViewHolder(convertView);
            convertView.setTag(holder);
        }else {
            holder = (ViewHolder) convertView.getTag();
        }
        // 使用框架加载网络图片
        Picasso.with(context).load(arr[position]).into(holder.iv);
        return convertView;
    }
    class ViewHolder{
        ImageView iv;
        public ViewHolder(View view){
            iv = view.findViewById(R.id.item_iv);
        }
    }
}
